Kirby Urner writes in part: 'Nevertheless, Brian Scott and RobinChapman, both very knowledgable mathematicians active on sci.math,have handed down their decision that quadrays are a subclassof barycentric coordinates.'

Prof. Chapman will have to speak for himself, but this is aninaccurate paraphrase of my actual statement that quadrays areessentially just barycentric coordinates. Since they obviously differin detail - including the one that gives barycentric coordinates theirname! - they are certainly not a subclass thereof.